"At the time the left digit of a source byte is examined, the rightmost four bits are checked for the existence of a sign code. When a sign code is encountered in the rightmost four bit positions, these bits are not treated as a decimal-digit code, and a new source byte is fetched from storage when the next pattern byte calls for a source-digit examination."
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Martin Trübner <[email protected]> Sent: Tuesday, February 24, 2026 12:25 PM To: [email protected] <[email protected]> Subject: Re: ED fail to generate 0C7 External Message: Use Caution Seymour, this is what it says: The leftmost four bits of each source byte must specify a decimal-digit code (0000-1001); a sign code (1010-1111) is recog- nized as a general-operand data exception. The rightmost four bits may specify either a sign code or a decimal-digit code. Martin Am 24.02.26 um 16:38 schrieb Seymour J Metz: > No, that's not what Pops says. The left nybble must be a valid digit and the > second nybble gives different results depending on whether it is a digit or a > sign. > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > עַם יִשְׂרָאֵל חַי > נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר > > > > > ________________________________________ > From: IBM Mainframe Discussion List<[email protected]> on behalf of > Martin Trübner<[email protected]> > Sent: Tuesday, February 24, 2026 4:17 AM > To:[email protected] <[email protected]> > Subject: Re: ED fail to generate 0C7 > > > External Message: Use Caution > > > Second attempt- maybe this time readable > > ED checks all left nibbles for num, the right nibble is not checked, but > interpreted (digit select, field separator , etc).... see POP. > > so 12 3A 56 7B as 4 char packed field is valid (ED does not care for single > field or multiple fields). > > 12 A3 45 67 is not valid because the second left nibble is not numeric > > Martin > > Am 23.02.26 um 20:48 schrieb martin: >> ED checks all left nibbles for num, the right nibble is not checked, but >> interpreted (digit select, field separator , etc).... see POP.MartinFrom a >> mobile, you can keep tpyos >> -------- Ursprüngliche Nachricht > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email [email protected] with the message: INFO IBM-MAIN > > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
